I work with OpenAL to play sounds in my app. When I test it using Instruments tool, it finds a leak:
LeakedObject = GeneralBlock-512
Size = 512 Bytes
Responsible Library = AudioToolbox
Responsible Frame = AU3DMixerEmbeddedInputElement::Initialize()
Stack trace:
0 libSystem.B.dylib malloc
1 libstdc++.6.dylib operator new(unsigned long)
2 libstdc++.6.dylib operator new[](unsigned long)
3 AudioToolbox AU3DMixerEmbeddedInputElement::Initialize()
4 AudioToolbox AU3DMixerEmbedded::SetProperty(unsigned long, unsigned long, unsigned long, void const*, unsigned long)
5 AudioToolbox AUBase::DispatchSetProperty(unsigned long, unsigned long, unsigned long, void const*, unsigned long)
6 AudioToolbox AUMethodSetProperty(void*, unsigned long, unsigned long, unsigned long, void const*, unsigned long)
7 OpenAL OALContext::InitializeMixer(unsigned long)
8 OpenAL OALContext::OALContext(unsigned long, OALDevice*, int const*, unsigned long&, double&)
9 OpenAL alcCreateContext
10 myApp -[myAudioManager initOpenAL] /Users/kpower/Documents/projects/myApp/Classes/myAudioManager.m:197
11 myApp -[myAudioManager init] /Users/kpower/Documents/projects/myApp/Classes/myAudioManager.m:83
12 myApp +[myAudioManager sharedInstance] /Users/kpower/Documents/projects/myApp/Classes/myAudioManager.m:316
13 myApp -[myMainMenu viewDidLoad] /Users/kpower/Documents/projects/myApp/Classes/myMainMenu.m:46
14 UIKit -[UIViewController view]
15 UIKit -[UIViewController contentScrollView]
16 UIKit -[UINavigationController _computeAndApplyScrollContentInsetDeltaForViewController:]
17 UIKit -[UINavigationController _layoutViewController:]
18 UIKit -[UINavigationController _startTransition:fromViewController:toViewController:]
19 UIKit -[UINavigationController _startDeferredTransitionIfNeeded]
20 UIKit -[UINavigationController viewWillLayoutSubviews]
21 UIKit -[UILayoutContainerView layoutSubviews]
22 UIKit -[UIView(CALayerDelegate) _layoutSublayersOfLayer:]
23 CoreFoundation -[NSObject(NSObject) performSelector:withObject:]
24 QuartzCore -[CALayer layoutSublayers]
25 QuartzCore CALayerLayoutIfNeeded
26 QuartzCore -[CALayer layoutIfNeeded]
27 UIKit -[UIView(Hierarchy) layoutIfNeeded]
28 UIKit -[UIViewController window:willAnimateRotationToInterfaceOrientation:duration:]
29 UIKit -[UIWindow _setRotatableClient:toOrientation:duration:force:]
30 UIKit -[UIWindow _setRotatableViewOrientation:duration:force:]
31 UIKit -[UIWindow _updateToInterfaceOrientation:duration:force:]
32 UIKit -[UIWindow setAutorotates:forceUpdateInterfaceOrientation:]
33 UIKit -[UIWindow setDelegate:]
34 UIKit -[UIViewController _tryBecomeRootViewControllerInWindow:]
35 UIKit -[UIViewController viewDidMoveToWindow:shouldAppearOrDisappear:]
36 UIKit -[UINavigationController viewDidMoveToWindow:shouldAppearOrDisappear:]
37 UIKit -[UIView(Internal) _didMoveFromWindow:toWindow:]
38 UIKit -[UIView(Hierarchy) _postMovedFromSuperview:]
39 UIKit -[UIView(Internal) _addSubview:positioned:relativeTo:]
40 UIKit -[UIView(Hierarchy) addSubview:]
41 myApp -[myAppAppDelegate applicationDidFinishLaunching:] /Users/kpower/Documents/projects/myApp/Classes/myAppAppDelegate.m:19
42 UIKit -[UIApplication _callInitializationDelegatesForURL:payload:suspended:]
43 UIKit -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:]
44 UIKit -[UIApplication handleEvent:withNewEvent:]
45 UIKit -[UIApplication sendEvent:]
46 UIKit _UIApplicationHandleEvent
47 GraphicsServices PurpleEventCallback
48 CoreFoundation __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__
49 CoreFoundation __CFRunLoopDoSource1
50 CoreFoundation __CFRunLoopRun
51 CoreFoundation CFRunLoopRunSpecific
52 CoreFoundation CFRunLoopRunInMode
53 UIKit -[UIApplication _run]
54 UIKit UIApplicationMain
55 myApp main /Users/kpower/Documents/projects/myApp/Classes/../main.m:13
56 myApp start
Code in initOpenAL (near the line 197):
device = alcOpenDevice(NULL);
if (NULL == device) return NO;
context = alcCreateContext(device, 0); // line 197 - tried using NULL instead of 0 - same result
if (NULL == context) return NO;
alcMakeContextCurrent(context);
It's not critical (it doesn't repeat from time to time, consuming memory), but how can I fix it?
I think this is a problem with the library itself as I also get problems and others report the same. Blame Apple for this. Hopefully they will sort this out soon.
来源：https://stackoverflow.com/questions/3837294/iphone-openal-audiotoolbox-leak